MEDC FB4 Notice Technique page 2

English
1.0 INTRODUCTION
These certified steady beacons have been designed for use in potentially explosive atmospheres and harsh
environmental conditions. The marine grade alloy or stainless steel enclosures are suitable for use offshore
or onshore, where light weight combined with corrosion resistance and strength is required.
2.0 INSTALLATION
General
When installing and operating explosion-protected equipment, requirements for selection, installation and
operation should be referred to e.g. IEE Wiring Regulations and the 'National Electrical Code' in North
America. Additional national and/or local requirements may apply.
Ensure that all nuts, bolts and fixings are secure.
Ensure that only the correct listed or certified stopping plugs are used to blank off unused gland entry points
and that the NEMA/IP rating of the unit is maintained. MEDC recommend the use of a sealing compound
such as HYLOMAR PL32 on the threads of glands and stopping plugs in order to maintain the IP rating of
the unit.
The beacon is directly mounted using the 2 off Ø9mm mounting holes in the base of the unit.
The holes have been designed to accept an M8 screw or bolt. MEDC recommend the use of stainless steel
screws.
Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.
Cable termination should be in accordance with specifications applying to the required application. MEDC
recommends that all cables and cores should be correctly identified. Please refer to the wiring diagram
provided with the product.
Ensure that only the correct listed or certified cable glands are used and that the assembly is shrouded and
correctly earthed.
All cable glands should be of an equivalent NEMA/IP rating to that of the beacon and integrated with the
unit such that this rating is maintained.
The internal earth terminal, where fitted, must be used for the equipment grounding connection and the
external terminal is for a supplementary bonding connection where local codes or authorities permit or
require such a connection.
Access to Terminals – Exd Units:
Unscrew the 3 off M8 screws (6.0mm A/F hexagon key) holding the cover assembly to the base. The cover
screws are captive and will be retained in the cover assembly.
Twist the cover assembly gently clockwise and anti-clockwise, whilst pulling it away from the base. Remove
to gain access to the interior. The cover will be remain attached to the base by means of a retention chain
Unscrew the 3 off slotted screws holding the reflector plate into the unit and lift the reflector assembly clear
of the unit, exposing the terminal block and internal earth stud. The slotted screws are captive and will be
retained in the reflector plate holes. The reflector assembly will remain attached to the enclosure by means
of a nylon retention strap. Care must be taken to avoid damage to the fluorescent tubes during cable termi-
nation.
Once termination is complete, carefully replace the reflector assembly onto the mounting pillars and secure
with the 3 off slotted screws.
Carefully replace the cover assembly back onto the base, avoiding damage to the mating surfaces, and
12/10 © Cooper MEDC 2010